13405391 has 4 divisors (see below), whose sum is σ = 13412784. Its totient is φ = 13398000.

The previous prime is 13405363. The next prime is 13405397. The reversal of 13405391 is 19350431.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 13405391 - 2²² = 9211087 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13405391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13405397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1091 + ... + 5291.

It is an arithmetic number, because the mean of its divisors is an integer number (3353196).

Almost surely, 2^13405391 is an apocalyptic number.

13405391 is a deficient number, since it is larger than the sum of its proper divisors (7393).

13405391 is an equidigital number, since it uses as much as digits as its factorization.

13405391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7392.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 13405391 is about 3661.3373239842. The cubic root of 13405391 is about 237.5526221348.

The spelling of 13405391 in words is "thirteen million, four hundred five thousand, three hundred ninety-one".